Johannes Rhellicanus

Johannes Müller (, also Rellikan or Rellikon, – 14 January 1542) was a Swiss clergyman and theologian of the Reformation in Switzerland, philologist and philosopher, noted for his work in early modern botany.

Rhellicanus first came to prominence as an apt pupil, and then teacher, of Latin, Greek, and Hebrew. He studied at the Jagellonian University in Kraków (1517–1522), and then at the University of Wittenberg (1522–1525).

In 1525, Rhellicanus became a teacher at St. George's Abbey, Stein am Rhein, near Zurich, where he taught Heinrich Bullinger during the latter's five-month stay in 1527 in Zürich to study languages and attend the Prophezei; both were followers of Huldrych Zwingli. In this, he made the earliest known description of the dark vanilla orchid, which was later named Gymnadenia rhellicani in his honor. Rhellicanus himself called the plant Christimanus (, "Christ's hand").

Other works of Rhellicanus include an encomium of Johannes Oecolampadius composed in Greek, and a translation into Latin from the Greek of the De Homero (On Homer) of Pseudo-Plutarch, which he entitles Homeri Vita, Ex Plutarcho ("The Life of Homer, From Plutarch")